blob: 9dd1a62c605ac6129777b0f4efe8c227523d67ad [file] [log] [blame]
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
namespace metrics {
// Interface for local storage of serialized logs to be reported.
// It allows consumers to check if there are logs to consume, consume them one
// at a time by staging and discarding logs, and persist/load the whole set.
class LogStore {
// Returns true if there are any logs waiting to be uploaded.
virtual bool has_unsent_logs() const = 0;
// Returns true if there is a log that needs to be, or is being, uploaded.
virtual bool has_staged_log() const = 0;
// The text of the staged log, as a serialized protobuf.
// Will trigger a DCHECK if there is no staged log.
virtual const std::string& staged_log() const = 0;
// The SHA1 hash of the staged log.
// Will trigger a DCHECK if there is no staged log.
virtual const std::string& staged_log_hash() const = 0;
// Populates staged_log() with the next stored log to send.
// The order in which logs are staged is up to the implementor.
// The staged_log must remain the same even if additional logs are added.
// Should only be called if has_unsent_logs() is true.
virtual void StageNextLog() = 0;
// Discards the staged log.
virtual void DiscardStagedLog() = 0;
// Saves any unsent logs to persistent storage.
virtual void PersistUnsentLogs() const = 0;
// Loads unsent logs from persistent storage.
virtual void LoadPersistedUnsentLogs() = 0;
} // namespace metrics